Suggestion to add PostgreSQL version column to repmgr cluster show command output

[xinferum]

Good afternoon.

Currently, the output of the repmgr cluster show command (https://repmgr.org/docs/current/repmgr-cluster-show.html) does not provide information about the PostgreSQL version in the cluster.

It would be convenient to see the PostgreSQL version in a separate column, like so:

| PostgreSQL version
----------------------
| 14.6
| 14.5
| 14.5

This is convenient, for example, to know on which nodes the minor version has already been updated, and where not. Whether the current minor version in the cluster is installed or not. Etc.